The ATS looks like it will be powered by a 2.5L Gen II model of the Ecotec. I find it hard to believe that Polaris wouldn't use one of their own engines, but the Ecotec was included in their patent drawings...
2.5
LCV
First appearing in the 2013
Chevrolet Malibu and 2013
Cadillac ATS, the 2.5 L
Gen III block has been reworked to reduce engine noise and vibrations, while improving fuel economy and low-end torque.
[12][13][14] LCV is scheduled to replace the direct-injected 2.4 L throughout North American GM products within a year.
[15] Engine production started in April 2012 at GM's
Tonawanda, New York plant.
The new combustion system developed with GM's proprietary computational fluid dynamics (CFD) analysis software features a higher compression ratio which helps improve fuel efficiency and has improved knock resistance. The engine features dual overhead camshafts with continuously variable valve timing and increased-authority cam phasing (increased phase rotation angle), a high-pressure returnless direct-injection fuel system with camshaft-driven fuel pump delivering 750 psi at idle and 2250 psi at full load, higher-flowing intake and exhaust ports in the cylinder head, electronic throttle control and pistons with jet-spray oil cooling. The engine redline is 7000 rpm.
The balance shafts are relocated from the cylinder block to oil pan module. The two-piece steel-aluminum oil pan features in-pan integrated oil-pump assembly driven by the balance shaft with a shorter inverted-tooth chain. Other improvements include inverted-tooth chain driving the camshaft, forged steel crankshaft, cast aluminum bedplate with main bearing cap inserts made of iron, high-pressure fuel rail with rubber-isolated assembly, acoustically shielded plastic cover for the intake manifold, and structurally enhanced aluminum camshaft cover and front cover. These improvements helped reduce noise intensity by 40% compared to the 2.4 L engine and change the noise signature into a higher frequency above 2,000 Hz. The engine also uses a variable-displacement oil pump and an actively controlled thermostat.
Direct injection reduces emissions by 25%, while
continuous cam phasing eliminates the need for an EGR system.
Displacement for the 2.5 L engine is 2,457 cc (149.9 cu in) with an 88.0 millimetres (3.46 in) bore and 100.8 millimetres (3.97 in) stroke. Compression ratio is 11.3:1.